Simplify $\left(3^{-8\cdot 7^3}\right)^{-2}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $-8\cdot 7^3$ and $n$ equals $-2$

Applicare la formula: $ab$$=ab$, dove $ab=-8\cdot -2\cdot 7^3$, $a=-8$ e $b=-2$

Applicare la formula: $a^b$$=a^b$, dove $a=7$, $b=3$ e $a^b=7^3$

Applicare la formula: $ab$$=ab$, dove $ab=16\cdot 343$, $a=16$ e $b=343$